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Cannot access SBS 2008 shares over PPTP VPN

We have a client for whom we have installed and set up an SBS 2008 box.

Everything is working fine apart from VPN.

The server is configured to allow all domain users VPN access.
There are no NAPs configured.
The firewall is OFF on both the SBS server and the client.

The VPN DOES successfully connect.
I CAN ping the server VIA IP, FQDN and NETBIOS names with no problem.

I CANNOT browse any shares on the server
I CANNOT use Outlook without enabling RPC access, which works fine.

The client IS being assigned an IP on the correct remote subnet.

When trying to connect via either RUN... \\servername\share OR \\FQDN\share OR \\IP address\share OR via a mapped drive, I get "Cannot connect to server \\servername as the specified network name is no longer available."
I ping, and there it is. This is not a name resolution issue.

Windows XP users do NOT have this problem, only W7 users (bad advert M$)


Please help!

Thanks
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quadraspleen
Asked:
quadraspleen
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1 Solution
 
Syed Mutahir AliTechnology ConsultantCommented:
What AV you have on your client ?

Have you tried disabling your antivirus on windows7 client and see if you can connect to the share via IP ? \\ip address\share ?
 
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quadraspleenAuthor Commented:
There is no av on client. Other clients with AV can connect fine.
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quadraspleenAuthor Commented:
Hi Experts,

This is still a serious issue and is affecting some XP clients as well. We have now run the FMNW and it has not made any difference.

Please can an expert comment?

Thanks.
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Syed Mutahir AliTechnology ConsultantCommented:
Windows 7 only - Fix to be able to map  network drives
   
On your windows 7 machine, logon as administrator (local admin or admin privilieges)

Open Control Panel and then go into Administrative Tools
 Double click on 'Local security policy'.
 In the left pane, click the triangle next to local policy.
 In the left pane, click security options.
 In the right pane near the bottom, double click "Network  security: LAN manager authentication level"
 In the drop-down box select "Send LM & NTLM responses".
 
Click Ok.

Can you do the above steps on your windows 7 client and report back.

Hope this helps


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quadraspleenAuthor Commented:
Hello Mutahir,

many thanks for this. Do you think it will work for XP clients as well?

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Syed Mutahir AliTechnology ConsultantCommented:
in your post you have mentioned that xp clients are not facing this problem of accessing the shares when connected via vpn

Windows XP users do NOT have this problem, only W7  users (bad advert M$)

On your windows 7 - try to map via IP As well but the above steps which i have mentioned worked for me in a few instances.
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Syed Mutahir AliTechnology ConsultantCommented:
Also, what is the network card on your server ? How  many nics and vendor ?

Try updating your NIC drivers as well.

Also, locally connected can you map network drives via xp and 7 ?
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quadraspleenAuthor Commented:
Hi Mutahir,

The server seems to have two slightly different NICs onboard. It has an active Intel PRO/1000 PM and a disabled Intel PRO/1000 PL. I'm not really sure why they are different or what the specification differences are; it's a Supermicro server. The driver revision is 9.12.30.0 which seems to be two years old. It also seems very hard finding drivers for these two NICs on the Intel website.

Yes, the entire domain is able to access and map locally; even non-domain PC's can map

cheers
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quadraspleenAuthor Commented:
Hello Mutahir,

This fix has not worked, unfortunately. We can still ping the server but when we try to map to it we get a "the specified network name is no longer available". Also, when we try to RDP to the server through the VPN it starts to set the connection up and then fails with a "cannot connect to the remote computer" as if it is alm ost there.

Can anyone shed any light on this please?

Thanks
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quadraspleenAuthor Commented:
**UPDATE**

We ended up contacting Microsoft PSS for a fix here. It turned out to be an MTU issue. We lowered the MTU on all devices between the server and the internet and it worked!

For info, we changed the MTU to 1384
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quadraspleenAuthor Commented:
Slef-Fix found!
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